By morning, Blade wasn't completely sure who was teaching whom.

They also show that he was not completely sure of its success.

I want to be completely sure before we go on.

Not completely sure where he's going most of the time but that's sort the appeal.

He seemed so at ease in the crowd, completely sure of himself.

She hadn't been completely sure about the two of them being a couple.

Nobody can be completely sure what a "yes" vote will mean.

I'm not completely sure that would be the right thing to do.

You would have to hold your own breath to be completely sure that he is breathing at all.

I mean, I'm not completely sure, but it was something like that.